Voltaic Key, Rings of Brighthearth, and Nyx Lotus

Prerequisites

• Voltaic Key on the battlefield
• Rings of Brighthearth on the battlefield
• Nyx Lotus on the battlefield
• undefined

Steps

1. Activate Nyx Lotus by tapping it, adding at least four mana of any color with which you have devotion
2. Activate Voltaic Key by paying and tapping it, targeting itself
3. Rings of Brighthearth triggers, causing you to pay to copy Voltaic Key's ability, targeting Nyx Lotus
4. Resolve both Voltaic Key abilities, untapping it and Nyx Lotus
5. Repeat

Results

• Infinite untap of artifacts you control
• Infinite mana artifacts you control can produce